import numbers
import random
import numpy as np
from PIL import Image, ImageOps, ImageFilter
#from config import cfg
import torch
import pdb
import cv2

# ===============================img tranforms============================

class Compose2(object):
    def __init__(self, transforms):
        self.transforms = transforms

    def __call__(self, img, mask, bbx=None):
        if bbx is None:
            for t in self.transforms:
                # print(t)
                # print('\\: ', img.size, mask.size)
                img, mask = t(img, mask)
                # print('//: ', img.size, mask.size)
            return img, mask
        for t in self.transforms:
            img, mask, bbx = t(img, mask, bbx)
        return img, mask, bbx

class FreeScale(object):
    def __init__(self, size):
        self.size = size  # (h, w)

    def __call__(self, img, mask):
        return img.resize((self.size[1], self.size[0]), Image.BILINEAR), mask.resize((self.size[1], self.size[0]), Image.NEAREST)

class FreeScaleMask(object):
    def __init__(self,size):
        self.size = size
    def __call__(self,mask):
        return mask.resize((self.size[1], self.size[0]), Image.NEAREST)

class Scale(object):
    def __init__(self, size):
        self.size = size

    def __call__(self, img, mask):
        # if img.size != mask.size:
            # print(img.size)
            # print(mask.size)
        assert img.size == mask.size
        w, h = img.size
        if (w <= h and w == self.size) or (h <= w and h == self.size):
            return img, mask
        if w < h:
            ow = self.size
            oh = int(self.size * h / w)
            return img.resize((ow, oh), Image.BILINEAR), mask.resize((ow, oh), Image.NEAREST)
        else:
            oh = self.size
            ow = int(self.size * w / h)
            return img.resize((ow, oh), Image.BILINEAR), mask.resize((ow, oh), Image.NEAREST)


class RandomRotate(object):
    """Crops the given PIL.Image at a random location to have a region of
    the given size. size can be a tuple (target_height, target_width)
    or an integer, in which case the target will be of a square shape (size, size)
    """

    def __init__(self, angle):
        self.angle = angle

    def __call__(self, image, label):
        # w, h = image.size
        # if w != 1280 or h != 720:
        #     image = image.resize(image, (1280, 720))
        # print(w, h)
        assert label is None or image.size == label.size

        angle = random.randint(0, self.angle * 2) - self.angle

        label = label.rotate(angle, resample=Image.NEAREST)
        image = image.rotate(angle, resample=Image.BILINEAR)

        return image, label



# ===============================label tranforms============================

class DeNormalize(object):
    def __init__(self, mean, std):
        self.mean = mean
        self.std = std

    def __call__(self, tensor):
        for t, m, s in zip(tensor, self.mean, self.std):
            t.mul_(s).add_(m)
        return tensor


class MaskToTensor(object):
    def __call__(self, img):
        return torch.from_numpy(np.array(img, dtype=np.int32)).long()


def find_start_pos(row_sample,start_line):
    # row_sample = row_sample.sort()
    # for i,r in enumerate(row_sample):
    #     if r >= start_line:
    #         return i
    l,r = 0,len(row_sample)-1
    while True:
        mid = int((l+r)/2)
        if r - l == 1:
            return r
        if row_sample[mid] < start_line:
            l = mid
        if row_sample[mid] > start_line:
            r = mid
        if row_sample[mid] == start_line:
            return mid

class RandomLROffsetLABEL(object):
    def __init__(self,max_offset):
        self.max_offset = max_offset
    def __call__(self,img,label):
        offset = np.random.randint(-self.max_offset,self.max_offset)
        w, h = img.size
        # print('max_offset:', self.max_offset, 'ro_offset: ', offset)
        img = np.array(img)
        if offset > 0:
            img[:,offset:,:] = img[:,0:w-offset,:]
            img[:,:offset,:] = 0
        if offset < 0:
            real_offset = -offset
            img[:,0:w-real_offset,:] = img[:,real_offset:,:]
            img[:,w-real_offset:,:] = 0

        label = np.array(label)
        if offset > 0:
            label[:,offset:] = label[:,0:w-offset]
            label[:,:offset] = 0
        if offset < 0:
            offset = -offset
            label[:,0:w-offset] = label[:,offset:]
            label[:,w-offset:] = 0
        return Image.fromarray(img),Image.fromarray(label)

class RandomUDoffsetLABEL(object):
    def __init__(self,max_offset):
        self.max_offset = max_offset
    def __call__(self,img,label):
        offset = np.random.randint(-self.max_offset,self.max_offset)
        # offset = np.random.randint(0, self.max_offset)
        # offset = 17
        # print('max_offset:', self.max_offset, 'do_offset: ', offset)
        w, h = img.size
        # if w != 1280 or h != 720:
        #     img = img.resize(img, (1280, 720))
        # print(w, h)
        img = np.array(img)
        if offset > 0:
            # print('dim > 0:', h - offset, offset)
            # print(img[offset:,:,:].shape, img[0:h-offset,:,:].shape)
            img[offset:,:,:] = img[0:h-offset,:,:]
            img[:offset,:,:] = 0
        if offset < 0:
            real_offset = -offset
            # print('dim < 0:', h - real_offset, real_offset)
            img[0:h-real_offset,:,:] = img[real_offset:,:,:]
            img[h-real_offset:,:,:] = 0

        label = np.array(label)
        if offset > 0:
            # print('dla > 0:', h - offset, offset)
            # # print(label[0:h-offset,:].shape, label[offset:,:].shape)
            # if label[0:h-offset,:].shape == label[offset:,:].shape:
            label[offset:,:] = label[0:h-offset,:]
            label[:offset,:] = 0
            # else:
            #     print(label[0:h - offset, :].shape, label[offset:, :].shape, '/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/')
        if offset < 0:
            offset = -offset
            # print('dla < 0:', h - offset, offset)
            label[0:h-offset,:] = label[offset:,:]
            label[h-offset:,:] = 0
        return Image.fromarray(img),Image.fromarray(label)